Various particle detectors use optical fibres for tracking or to bring light from scintillators to photo sensors. In order to detect the photons, the fibres are typically aligned to arrays of SiPMs and these are read out with dedicated ASICs. We propose a novel, fully integrated solution based on an array of Single Photon Sensitive Avalanche Diodes (SPADs) fabricated in a CMOS technology, i.e. combining photo sensors and electronics on the same chip. Our architecture allows assigning the SPADs to arbitrary groups so that no alignment of the fibres is required. The sensitive area of one group is confined to just the fibre, and bad SPADs can be masked, so that dark counts are minimised. The low power, data driven architecture delivers a hit multiplicity and time on a digital output per group. We will present the architecture and measurements obtained with a prototype chip. Our approach could greatly reduce mechanical complexity and cost of fibre readouts at improved performance.
|TIPP2020 abstract resubmission?||No, this is an entirely new submission.|